Wyniki wyszukiwania - Biblioteka Nauki

1

Endogenous timing in a vertically differentiated mixed duopoly with Cournot competition

100%

Feng L. , Gu M.

Archives of Control Sciences

|

2016

|

tom Vol. 26, no. 2

161--175

EN

This paper compares the equilibrium outcomes under simultaneous and sequential output setting in a mixed duopoly in a vertically differentiated market. When the timing of the output game is determined endogenously, it is shown that simultaneous play in the quality stage with the public firm acting as the high-quality producer and simultaneous play in the second period in the output stage turn out to be the unique subgame perfect Nash equilibrium, which contrasts with the endogenous timing in a purely private duopoly.

2

Peripheral challenge by Small and Medium Sized Ports (SMPs) in Multi-Port Gateway Regions: the case study of northeast of China

100%

Feng L. , Notteboom T.

Polish Maritime Research

|

2013

|

tom 20

|

nr Special Issue S1

EN

This paper focuses on the role of small and medium-sized ports (SMPs) in enhancing the competitiveness and logistics performance of multi-port gateway regions and associated inland logistics systems. The concepts developed will be applied to the ports in the northeast of China, a multi-port gateway region around the Bohai Sea Economic Rim (BER). Port competition is analyzed by multi-variable methodology and generalized common characteristics of SMPs compared to gateway ports, and the similarities of SMPs and SMEs are also compared. Later in this paper, we analyze the role of a SMP in such region in different variables: (a) cargo volume and market share; (b) international connectivity; (c) relative cluster position; (d) port city and hinterland connection; and (e) logistics and distribution function. The five-dimension analysis combined with in-depth cases study of typical Yingkou port describes a profile of SMPs in the BER and provides future study possibility for more SMPs cases worldwide

3

Peripheral challenge by Small and Medium Sized Ports (SMPs) in Multi-Port Gateway Regions: the case study of northeast of China

100%

Feng L. , Notteboom T.

Polish Maritime Research

|

2013

|

tom S 1

55--66

EN

This paper focuses on the role of small and medium-sized ports (SMPs) in enhancing the competitiveness and logistics performance of multi-port gateway regions and associated inland logistics systems. The concepts developed will be applied to the ports in the northeast of China, a multi-port gateway region around the Bohai Sea Economic Rim (BER). Port competition is analyzed by multi-variable methodology and generalized common characteristics of SMPs compared to gateway ports, and the similarities of SMPs and SMEs are also compared. Later in this paper, we analyze the role of a SMP in such region in different variables: (a) cargo volume and market share; (b) international connectivity; (c) relative cluster position; (d) port city and hinterland connection; and (e) logistics and distribution function. The five-dimension analysis combined with in-depth cases study of typical Yingkou port describes a profile of SMPs in the BER and provides future study possibility for more SMPs cases worldwide.

4

Dispersion calculation method based on S-transform and coordinate rotation for Love channel waves with two components

100%

Feng L. , Zhang Y.

Acta Geophysica

|

2017

|

tom Vol. 65, no. 4

757--764

EN

Dispersion analysis is an important part of in-seam seismic data processing, and the calculation accuracy of the dispersion curve directly influences pickup errors of channel wave travel time. To extract an accurate channel wave dispersion curve from in-seam seismic two-component signals, we proposed a time–frequency analysis method based on single-trace signal processing; in addition, we formulated a dispersion calculation equation, based on S-transform, with a freely adjusted filter window width. To unify the azimuth of seismic wave propagation received by a two-component geophone, the original in-seam seismic data undergoes coordinate rotation. The rotation angle can be calculated based on P-wave characteristics, with high energy in the wave propagation direction and weak energy in the vertical direction. With this angle acquisition, a two-component signal can be converted to horizontal and vertical directions. Because Love channel waves have a particle vibration track perpendicular to the wave propagation direction, the signal in the horizontal and vertical directions is mainly Love channel waves. More accurate dispersion characters of Love channel waves can be extracted after the coordinate rotation of two-component signals.

5

Improved RoI-based remote sensing image compression

100%

Feng L. , Jiaxiong P.

Image Processing & Communications

|

2003

|

tom Vol. 9, no 1-2

3-15

EN

The paper proposes an improved version of Rol - based coding for compressing remote sensing images. A fully automatic background - clustering algorithm is used based on some features which have fully considered the characteristics of region of interest - based image compression scheme. The new model has three advantages: allowing near-lossless Rol segmentation; reducing the ambiguity of reconstructed Rol edge; enhancing intelligibility for Rol in reconstructed image. The paper also introduce Wold feature. The feature can capture random texture as well as structural texture, and hence is better than other purely stochastic texture features. Some results on remote sensing images arę presented.

6

Effects of grassland tourism on Alpine meadow community and soil properties in the Qinghai-Tibetan Plateau

80%

Feng L. , Gan M. , Tian F.-P.

Polish Journal of Environmental Studies

|

2019

|

tom 28

|

nr 6

7

Adsorption mechanism of sodium oleate on titanium dioxide coated sensor surface using quartz crystal microbalance with dissipation

71%

Fan G. , Liu J. , Cao Y. , Feng L. , Xu H.

Physicochemical Problems of Mineral Processing

|

2016

|

tom Vol. 52, iss. 2

597--608

EN

Quartz Crystal Microbalance with Dissipation (QCM-D) was firstly applied to investigate the adsorption mechanism of sodium oleate on TiO2 coated sensor surface. The effects of pH value, sodium oleate concentration, and temperature on TiO2 coated sensor surface were evaluated systematically using the QCM-D technique. Zeta potential, surface tension, adsorption isotherms, and adsorption thermodynamics were employed to characterize the adsorption process. The results showed the advantages of QCM-D on the investigation of the adsorption process. Additionally, the electrostatic equilibrium adsorption data was well matched to the Langmuir isotherm. Based on the thermodynamic analysis, adsorption was a spontaneous and endothermic physisorption process.

8

Output Characteristics and MPPT Research for PV Array dunder Partially Shaded Conditions

71%

Jia L. , Chen K. , Li G. , Feng L. , Jiang X.

Przegląd Elektrotechniczny

|

2013

|

tom R. 89, nr 1b

279--283

EN

MPPT(maximum power point tracking) has been one of the hot issues in PV power system all the time. At present, most of MPPT methods are very efficient only under uniform irradiance. However, the output power-voltage curve presents multi-peak characteristics under PSCs (partially shaded conditions), which is one challenge of the MPPT technology. In this paper, the segment characteristics of PV array, which is made by PV modules in series-parallel (SP) connection, was analyzed in details under PSCs. And then a GMPPT (global maximum power point tracking) algorithm was proposed based on the segment model. The MPPT controller using this algorithm can rapidly locate the segment where the GMPP(Global Maximum Power Point) is in and then converges the working point to GMPP using an improved InC (Incremental Conductance) method. A Matlab/SIMULINK model verifies that the proposed algorithm is efficient under both uniform irradiance and PSCs.

PL

System śledzenia warunków maksymalnej mocy MPPT jest powszechnie stosowany w systemach fotowoltaicznych. Systemy te w większości działają w warunkach jednorodnego nasłonecznienia. W artykule zaproponowano system śledzenia mocy w warunkach częściowego nasłonecznienia.

9

A survey of cellulolytic bacteria in Qinghai-Tibet Plateau:iIsolation, identification and characterization

61%

Lin L. , Qin N. , Chen M. , Shi R. , Feng L. , Huang D. , Yang Q.

Polish Journal of Environmental Studies

|

2020

|

tom 29

|

nr 2

10

Isolation of 2-phenylethanol biosynthesis related genes and their relationship with 2-phenylethanol accumulation in Rosa rugosa

61%

Feng L. , Wang M. , Wang J. , Zang S. , Xia W. , Sheng L.

Acta Physiologiae Plantarum

|

2015

|

tom 37

|

nr 12

EN

Rosa rugosa is a famous traditional flower in China used not only as a landscape plant but also as a timehonored and valuable aromatic plant. The natural aromatic substance 2-phenylethanol is the major indispensable ingredient of rose flower and rose essential oil. This study adopted R. rugosa ‘Tanghong’ as a test material to isolate 2-phenylethanol biosynthesis related genes RrAADC and RrPAR. The temporal and spatial expression patterns of the two genes in different flower developmental stages and floral organ parts were measured, and the relationship of 2-phenylethanol accumulation to RrAADC and RrPAR expression in R. rugosa was determined. The content of 2-phenylethanol in R. rugosa gradually increased with the degree of flower opening and peaked at the withering stage. The expression level of RrAADC gradually decreased with the degree of flower opening. Meanwhile, the expression level of RrPAR gradually increased from the budding stage to the half opening stage, rapidly decreased at the full opening stage, and slightly increased again toward the withering stage. The content of 2-phenylethanol was the highest in the petals, followed by that in the stamens and pistils. However, this compound was not detected in other parts of the fully opened flower. The expression level of RrAADC peaked in the stamens but was relatively low in the other parts. The expression level of RrPAR was the highest in the stamens and calyxes, followed by that in the pistils and receptacles, and the lowest in the petals and stalks. These results suggest that RrAADC and RrPAR coordinately regulate the biological synthesis of 2-phenylethanol in R. rugosa.

11

Habitat selection and the change in distribution of Asian elephants in Mengyang Protected Area, Yunnan, China

61%

Lin L. , Feng L. , Pan W. , Guo X. , Zhao J. , Luo A. , Zhang L.

Acta Theriologica

|

2008

|

tom 53

|

nr 4

EN

Elephants were confined to Mengyang Protected Area in China and their distribution range had reduced greatly compared to past records. A preliminary study of habitat selection by Asian elephantsElephas maximus Linnaeus, 1758 and their distribution was conducted in Mengyang Protected Area and its surrounds using site visits and transect surveys from July 2003 to December 2006. Although no variable significantly influenced their habitat selection, elephants still showed preference for altitudes between 900 and 1200 m, gradients <30°, and orientations to the south-east, south and south-west. Human activities, including habitat transformation and degradation, disturbance by large infrastructure and poaching were considered to be the main factors inducing elephant distribution changes.

12

Fabrication and photoelectrical properties of a novel violet and blue enhanced SINP silicon photovoltaic device

57%

Bo H. , Ma Z. Q. , Jing X. , Lei Z. , Sheng Z. N. , Feng L. , Feng L. , Cheng S. , Ling S. , Jie M. X. , Jie M. X. , Yue Z. C. , Shan Y. Z. , Ting Y. Y.

Optica Applicata

|

2009

|

tom Vol. 39, nr 3

547-560

EN

A novel ITO/SiO2/np-silicon violet and blue enhanced photovoltaic device with SINP structure has been fabricated by thermal diffusion of phosphorus. The shallow junction was formed to enhance the spectral responsivity within the wavelength range of 400-600 nm. An ultrathin silicon dioxide was thermally grown at low temperature and RF sputtering of ITO antireflection coating to reduce the reflected light and enhance the sensitivity. The crystalline structure, optical and electric properties of ITO film were determined by an XRD, UV-VIS spectrophotometer, a four point probe and the Hall effect measurement, respectively. The results show that ITO film has high quality. The current-voltage (I-V) characteristics, spectral response and responsivity of the photovoltaic device with high quantum efficiency of violet SINP and deep junction SINP structure were calculated and analyzed in detail.

13

Transcriptome-sequencing analyses reveal putative genes related to flower color variation in Chinese Rosa rugosa

51%

Sheng L. , Xia W. , Zang S. , Zeng Y. , Yuan X. , Ning G. , Zhang S. , Feng L.

Acta Physiologiae Plantarum

|

2018

|

tom 40

|

nr 03

14

Development and application of a TaqMan-MGB real-time RT-PCR assay for the detection of porcine epidemic diarrhoea virus strains in China

41%

Hou Y.-X. , Xie C. , Wang K. , Zhao Y.-T. , Xie Y.-Y. , Shi H.-Y. , Chen J.-F. , Feng L. , Tong G.-Z. , Hua X.-G. , Yuan C.-L. , Zhou Y.-J. , Yang Z.-B.

Journal of Veterinary Research

|

2016

|

tom 60

|

nr 2

15

Structural, electrical and optical properties of AZO/SiO2/p-Si SIS heterojunction prepared by magnetron sputtering

41%

Bo H. , Ma Z. Q. , Jing X. , Lei Z. , Sheng Z. N. , Feng L. , Cheng S. , Ling S. , Jie M. X. , Yue Z. C. , Shan Y. Z. , Ting Y. Y.

Optica Applicata

|

2010

|

tom Vol. 40, nr 1

15--24

EN

ZnO thin films doped with aluminum (AZO) were deposited on silicon dioxide covered type texturized Si substrates by radio frequency magnetron sputtering, to fabricate AZO/SiO2/p-Si heterojunction, as an absorber for ultraviolet cell. The microstructure, optical and electrical properties of the Al-doped ZnO films were characterized by XRD, SEM, UV-VIS spectrophotometer, current-voltage measurement, and four point probe technique, respectively. The results show that AZO films are of good quality. The electrical junction properties were investigated by I-V measurement, which reveals that the heterojunction shows rectifying behavior under a dark condition. The ideality factor and the saturation current of this diode are 24.42 and 8.92×10-5 A, respectively. And the values of IF/IR (IF and IR stand for forward and reverse current, respectively) at 10 V are found to be as high as 38. It shows fairly good rectifying behavior indicating formation of a diode between AZO and p-Si.

16

Genomics and the evolution of aminoacyl-tRNA synthesis

36%

Ruan B. , Ahel I. , Ambrogelly A. , Becker H. D. , Bunjun S. , Feng L. , Tumbula-Hansen D. , Ibba M. , Korencic D. , Kobayashi H. , Jacquin-Becker C. , Mejlhede N. , Min B. , Raczniak G. , Rinehart J. , Stathopoulos C. , Li T. , Soll D.

Acta Biochimica Polonica

|

2001

|

tom 48

|

nr 2

EN

Trans la tion is the pro cess by which ri bo somes di rect pro tein syn the sis us ing the genetic in for ma tion con tained in mes sen ger RNA (mRNA). Trans fer RNAs (tRNAs) are charged with an amino acid and brought to the ri bo some, where they are paired with the cor re spond ing trinucleotide codon in mRNA. The amino acid is at tached to the nascent polypeptide and the ri bo some moves on to the next codon. Thus, the se quen tial pair ing of codons in mRNA with tRNA anticodons de ter mines the or der of amino acids in a pro tein. It is there fore im per a tive for ac cu rate trans la tion that tRNAs are only cou pled to amino ac ids cor re spond ing to the RNA anticodon. This is mostly, but not exclusively, achieved by the di rectattachmentoftheappropriateaminoacidtothe 3 -end of the cor re spond ing tRNA by the aminoacyl-tRNA syn the tas es. To en sure the accurate translation of genetic information, the aminoacyl-tRNA synthetases must display an extremely high level of substrate specificity. Despite this highly conserved function, re cent stud ies aris ing from the anal y sis of whole genomes have shown a significant de gree of evo lu tion ary di ver sity in aminoacyl-tRNA syn the sis. For ex am ple, non-canonical routes have been iden ti fied for the syn the sis of Asn-tRNA, Cys-tRNA, Gln-tRNA and Lys-tRNA. Char ac ter iza tion of non-canonical aminoacyl-tRNA synthesis has re vealed an un ex pected level of evo lu tion ary di ver gence and has also pro vided new in sights into the pos si ble pre cur sors of con tem po rary aminoacyl-tRNA syn the tases.